BMW 745i Rear Deck Lid Speaker Size
The BMW 745i rear deck lid accommodates 0.75 inch units and a 4 inch speaker size across all listed configurations. Compatible types for these locations include tweeters and midrange audio components within the system. These specifications cover the 2002 to 2005 model range.
| Year | Type | Size (inch) |
|---|---|---|
| 2005 | Tweeter | 0.75 |
| 2005 | Midrange | 4 |
| 2004 | Tweeter | 0.75 |
| 2004 | Midrange | 4 |
| 2003 | Tweeter | 0.75 |
| 2003 | Midrange | 4 |
| 2002 | Tweeter | 0.75 |
| 2002 | Midrange | 4 |
Speaker Types
| Type | Description |
|---|---|
| Tweeter | A small driver built for high frequencies, typically from about 2,000 Hz to 20,000 Hz. It adds treble detail and clarity and is usually mounted near ear level or aimed at the listener. |
| Midrange | A driver for the middle of the audible range, typically from about 300 Hz to 5,000 Hz, where vocals and most instruments sit. It is often paired with a tweeter and a woofer. |
Additional Notes
- The BMW 745i rear deck lid accommodates 2 distinct speaker sizes across all listed model years: 0.75 inch and 4 inch.
- The rear deck lid is a horizontal surface positioned at the rear of the cabin, typically spanning the width of the trunk opening beneath the rear window, which places speakers in a rearward-facing or upward-angling orientation relative to the passenger compartment.
- A 0.75 inch tweeter is designed to reproduce high-frequency content, generally operating in the range of approximately 3,500 Hz and above, where short wavelengths benefit from a compact driver with a lightweight diaphragm capable of rapid movement.
- Mounting a 0.75 inch tweeter on the BMW 745i rear deck lid places high-frequency output at the rear of the cabin, where the upward orientation allows treble energy to radiate toward the headliner and reflect into the listening area.
- A 4 inch midrange driver handles the middle portion of the audible spectrum, typically covering frequencies from roughly 300 Hz to 5,000 Hz, capturing fundamental vocal frequencies, upper harmonics, and instrumental presence.
- At 4 inches, the cone diameter is large enough to move sufficient air for midrange output while remaining compact enough to fit within the shallow, restricted depth typical of a rear deck lid enclosure.
- The pairing of a 0.75 inch tweeter and a 4 inch midrange in the BMW 745i rear deck lid constitutes a 2-way speaker arrangement at that location, with each driver covering a separate frequency band.
- Rear deck lid installations generally impose constraints on mounting depth, as the structural panel must accommodate the trunk cavity below, which limits the permissible basket depth for any installed driver.
- A midrange driver at the rear deck location reinforces the mid-frequency presence perceived from the rear seating positions and contributes to overall cabin fill in the midband.
- Tweeters placed at the rear deck level are positioned lower and farther from the front listening position compared to A-pillar or door-mounted tweeters, which influences the perceived stereo imaging and high-frequency directionality from the front seats.